Incandescent electric lamp



(No Model.)

P. SCHAEPBR. l INGANDESNT ELECTRIC LAMP.

No. 352,006. Patented Nov. 2.11886.

UNITEDl STATES FnEDEnroK SCHAEFER, oF

, PATENT OFFICE.

BOSTON', MASSACHUSETTS.

lNczANDEsol-:NT E LECTmCLAM P.

SPECIFICATION forming part of Letters Patent No. 352,006, dated November2, 1,886.

Application'led March l1, 1886.

To all whom it may concern:

Be it known that I, FREDERICK SCHAEFER, of Boston, county of Suffolk,and State of Massachusetts, have invented an Improvement in IncandescentElectric Lamps,of which the following description, in connection withthe accompanying drawings, is a specication, like letters on thedrawings representing like parts. This invention relates to and is animprovement on that class of incandescent electric lamps shown anddescribed in United States application Serial No. 179,601, dated October12, 1885, and has for its object to provide said lamp with means to stopthe rotation of the lamp proper` within its holder,to thereby permitshort-circuiting of said lamp.

The peculiar features wherein this invention consists will behereinafter pointed out inthe claims at the end of this specication.

Figure l is a vertical section of a complete incandescent electric lampembodying my invention; Fig. 2, a section of Fig. l on line m :v withthe shade removed; Fig. 3,a side elevation of the insulating-diskpartially broken out, the key being removed; Fig. 4, a'view of Fig. 3,looking upward; and Figs. 5 and 6,de tails to be referred to.

The bulb A, containing the carbon lament a and platinum electrodes a a2,is embedded in the plaster-ofparis mold a3, in which are secured theterminal lugs at ai", to which the platinum electrodes are attached. Themold a3 is surrounded by the metal band b,provided with the pins orprojections b b2, ,which enter slots b3 b* (see Fig. 2) in the shell orcasing B of the holder, and are rotated in a groove, b5, in said casingor shell. The shell or casing B contains within it the spring d, thedisk d', of insulating material,separated from said sprin g by a washer,d2, of insulating material, Said insulating-disk being slotted at d3(see Figs. 3 and 4) to receive a key, dx, by rotating which the lamp maybe placed in and cut out of circuit, as desired. v.

The insulating-disk d has'secured to one of its faces, by screws d'L d5,contact-pieces e e', each of said contact-pieces being provided with anoutturned ange, e2, said iianges being preferably in the sainediametrical line, as

5o shown in Fig. 4, the contact-piece e being extended over the slotdthe screw d5 being conserial No. 194,832. (No model.)

nected to one line-wire by the wire e". The wiref, which is connected tothe Second linewire, is secured to the screw f', extended through t-heinsulating-disk d', andscrewed into a metallic ring, f2, (see Fig. 3,)secured to the opposite face of the disk d,the said metallic ring beingupset, as at ft The key dx is composed of a metal collar,h, havinginsulation h,(see Fig. 6,) the metal part of said collar having a shank,h2, on which is Secured a handle-hs, the insulation being provided witha groove, 2, and the metal with a groove, 3.

-The collar referred to is designed to enter the slot d3 and to berotated therein by turning the handle hand the said collar is locked andmaintained in position within said slot by the upset portion f4 of themetallic ring f2, which enters one of the grooves 2 3, referred to,according as the lamp is in or out of circuit, and also by means ofwashers h5 h6, which are mounted on the shank h2 of said co1- lar, andwhich act frictionally, to further lock and maintain said collar inposition, said washers being one on the insidev and the other on theoutside of the shell or casing B,as shown in Fig. 1.

When it is desired to place the lamp in circuit, the handle h3 is turnedso as to have the metal portion h of the collar engaged by thecontact-piece e on one side and by the metal ring f2 on the otherside,the upset portion f 4 of said ring'entering the groove 3 andlocking the key dx until positively moved.

With the lamp in circuit,the current enters the lamp by wire e* to thecontact-piece e, from contact-piece e through the filament a tocontact-piece e,from contact-piece e to the metallic ring f2 by themetal portion h of the collar, and from the metal ring f2 to the wirefby Screwf.

The manner of completing the circuit in the lamp as just described isespecially advantageous in this class of incandescent electric lamps.When the lamp proper is connected to its holder, all danger ofshort-circuiting of said lamp is obviated by means of the upturnedflanges e2, which limit the rotation of the lamp in its holder.

In Fig. 5 I have shown a shade, g, partially broken off, and providedwith a collar, g', hav- ICO ing` grooves g g3, by means of which saidshade l sulating-disk d, provided on one face with the is placed uponthe lamp; but said shade is not herein claimed, as it forms thesubject-matter of another application led concurrently here- 5 with,Serial No. 194,833.

I claiml. In an incandescent electric lamp, the bulb A,the mold to holdsaid bulb, and terminal lugs a4 a5, inoased in said mold, combined withthe insulating-disk' d', having Contactpieces e e secured thereto, andprovided with outwardly-turned anges e, to be engaged by said lugs, tothereby prevent said lamp from being shortcircuited, substantially asder 5 scribed.

2. In an incandescent electric lamp, the inmetal ring f2, upset as atf,and having con` tact-pieces ce scoured to its opposite face, combinedwith the key dx, composed of a metal 2o collar, h', having insulation h,and with the screw f, secured to the metal ring f2, and by which thecurrent is conducted to the linewire, substantially as described.

In testimony whereof I have signed my name 2 5 to this specification inthe presence of two subscribing witnesses.

FREDERICK SCHAEFER.

Vitnesses:

J. H. CHURCHILL, B. J. NOYES.

